One-ninth of the American ICBM strike force went offline on Saturday, according to a report on the Web site of the U.S. magazine The Atlantic, as a series of control errors multiplied beyond the ability of engineers to compensate.

The squadron of 50 missiles affected is stationed at F.E. Warren Air Force Base in Wyoming, said the report. The weapons are controlled by five launch control center computers (LCCs), which periodically interrogate the on-board guidance systems of the weapons to confirm their status. According to the report, one LCC began to ping the missiles out of sequence, causing the guidance systems to return errors.